Rockwell Automation 1398 N-Series Brushless Servo Motor Manual - Manual (Page 10)

Motor Radial Load Force Ratings
Motors are capable of carrying an axial load in most applications. The following table provides
guidelines for 20,000 hour bearing life with a specified radial load applied to the center of the shaft.
Please consult with Reliance Motion Control regarding loads, operating speeds and bearing life in
your particular application to ensure the proper selection of motors.
Brake Motor Application Guidelines
The brakes offered as options on these servo motors are holding brakes. They are designed to hold
the motor shaft at 0 rpm for up to the rated brake holding torque. The brakes are spring-set type, and
release when voltage is applied to the brake coil.
The brakes are not designed for stopping rotation of the motor shaft. Servo drive inputs should be
used to stop motor shaft rotation. The recommended method of stopping motor shaft rotation is to
command the servo drive to decelerate the motor to 0 rpm, and engage the brake after the servo drive
has decelerated the motor to 0 rpm.
If system main power fails, the brakes can withstand use as stopping brakes. However, use of the
brakes as stopping brakes creates rotational mechanical backlash that is potentially damaging to the
system, increases brake pad wear and reduces brake life. The brakes are not designed nor are they
intended to be used as a safety device.
A separate power source is required to disengage the brake. This power source may be controlled by
the servo motor controls, in addition to manual operator controls.
Brake Specifications
STANDARD RADIAL LOAD FORCE RATINGS
500 rpm 1000 rpm 2000 rpm 3000 rpm 4000 rpm 5000 rpm 6000 rpm
MOTOR lb (kg) lb (kg) lb (kg) lb (kg) lb (kg) lb (kg) lb (kg)
N-2302 17 (8) 16 (7) 14 (6) 12 (5) 11 (5) 9 (4) 8 (4)
N-2304 19(9) 17 (8) 15 (7) 14 (6) 12 (5) 10 (5) 8 (4)
N-3406 103 (47) 82 (37) 65 (29) 56 (25) 51 (23) 48 (22) 45 (20)
N-3412 113 (51) 89 (40) 71 (32) 62 (28) 56 (25) 53 (24) 49 (22)
N-4214 137 (62) 109 (49) 86 (39) 76 (34) 68 (31) 64 (29)
N-4220 146 (66) 116 (53) 92 (42) 80 (36) 73 (33) 68 (31)
N-5630 188 (85) 149 (68) 118 (54) 103 (47) 94 (43)
N-5637 197 (89) 156 (71) 124 (56) 108 (49) 98 (44)
N-5647 203 (92) 161 (73) 128 (58) 112 (51)
NOTE: When motor shaft has no radial load, axial load rating = 100% of radial load rating above.
When motor shaft has both a radial load and an axial load, axial load rating = 44% of radial load rating above.
BRAKE DATA
MOTOR MAX. BACKLASH HOLDING TORQUE COIL CURRENT
SERIES (BRAKE ENGAGED) (lb/in) (Nm) at 24 VDC
N-2300 1 degree 5 0.56 0.28 ADC
N-3400 15 1.69 0.36 ADC
N-4200 30 3.39 0.36 ADC
N-5600 50 5.64 0.71 ADC
P0010
Axial load force
Radial load force applied at center of shaft extension